<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script type="text/javascript">

function addSheet(text)
{
  var head = document.getElementsByTagName("head")[0];
  var sheet = document.createElement("style");
  sheet.appendChild(document.createTextNode(text));
  head.appendChild(sheet);
}

</script>

<style>colgroup:before { content: '0'; }</style>

</head>

<body onload="addSheet('x { }');"><table><colgroup></colgroup></table></body>
</html>
